Easiest way is to just buy them from the itunes store then connect your ipod to the computer. \
If you are downloading the vids, you will first need to download a free program off the internet that anables you to shrink the screen size of the video so that is fits onto your ipod. Just google it and it will come up. once you have shrunk the video put it into your video folder in your itunes library and connect your ipod.
It's really easy to do, just sounds difficult